Lathe-chuck



(No Model.)

Witnesses J. H. UURRY.

LATHE GHUGK.

Patented Dec. '7, 1886.

u i IM lfm"ii l mi Fig. 3.

QMMMH. CMM/L Inven'tor` Aitorney NA PETERS, Phomumogrzpher Waungiun. D C

UNITED STATES PATENT OFFICE.

JAMES HENRY CURRY, OE VILKINSBURG, PENNSYLVANIA,l ASSIGNOR OF TWO-THIRDSTO EDGAR J.BAKER, OF CLEVELAND, AND PERRIN G.

MARCH, OE CINCINNATI, OHIO.

LATH'E-CHUCK.

SPECIFICATION forming part of Letters Patent'. No. 353,736, datedDecember 7, 1886.

Application filed January 30. i856. Serial No. 190,253. (No model.)

To all w/Lom it may concern.-

Be it known that I, JAMEs HENRY CURRY, of Vilkinsburg, Allegheny county,Pennsylvania, have inventedcertain new and useful Improvements inLathe-Chucks, of which the following is a specification.

This invention pertains to improvements iu lathe-chucks used bybrass-workers and others; and the invention relates particularly to the1o construction and arrangement of thejaws, as will be readilyunderstood from the following description, taken in connection with theaccompanying-drawings, in which- Figure l is a side elevation, halflongitudinal section, of a lathe-chuck illustrating my invention; Fig.2, a face view of the same; and Fig. 3, an end elevation, halftransverse section, of the same.

In the drawings I have shown my improve- 2o ments as embodied in atwo-jawed universal chuckthat is, both jaws ofthe chuck are movedsimultaneously by a single screw.

The improvements are applicable to chucks with any number of jaws movedby a single screw or otherwise.

In the drawings, A indicates the chuckbody, provided with the usualfacial slot to form the slideway for the jaws; B, the hub of the same,adapted to be threaded to t upon 3o the nose of the lathe-spindle; C,the chuckscrew arranged in the usual manner to move the sliding chuck-jaws; D, the usual side tongues projecting inward from the side wallsof the slot to form an under hold for thejaws;

3 5 E, the jaw-slides tting the slot of the chuckbody and tapped to formnuts for the chuckscrew; F, the usual caps or screw-bearings at the endsof the slot, these bearings being shown separately formed and held inplace by 4o screws; G, outward prolongations of the jawslides, servingto lengthen the bearing of the slides in that portion of the slotoutside the tongues; H, a similar inward prolongation of the slides tothe rear of the tongues; J, cylindrical studs, formed, preferably,integrally with and projecting outwardly from the jawslides and providedwith end nuts; K, disklike jaws fitted to revolve upon the studs and tobe irmly clamped against the jaw-slides by the nuts upon the studs; L, acircumferential 5o series of work holding recesses or notches formed inthe jaws, and M dowel-pins projecting outwardly from the face of thejaw-slides, and adapted for engagement with any one of the series ofdowel-holes formed in the rear face of the jaws.

There are as many dowel-holes as there are notches or recesses in thejaws. By removing the nuts upon the studs the jaws may be pulledoutwardly and disengaged from the dowel- 6o pins and then turned untilany chosen notch is presented toward the center of the chuck, afterwhich the jaws are clamped firmly against the jaw-slides. The differentnotches orrecesses are to be of asize and shape adapted to suitdifferent characters of work. These notches may be segments of circlesadapted to grasp differently-sized pieces, or they may be irregularnotches adapted to engage with pieces of special shapes which it isdesired to oper- 7o ate on in the lathe; and in some cases the charactercf the work may require that the notches in the opposing jaws should beof different character.

The prolongations G and H serve to brace the j awslides in such a manneras best to meet the working strains upon them without necessitating thelengthening of that portion of the jaw-slide which forms the nut for thechuckscrew.

After the jaws are adjusted rotarily upon their slides into the desiredpositions the chuck is operated in the usual manner; in other words,after adjusting the jaws rotarily in the manner above described, thejaws are, by 8 5 means of the screw or screws, or other usual devices bywhich radial motion is given to them, moved outwardly a sufficientdistance to enable the work in hand to be inserted in the chuck betweenthe jaws, after which the 9o jaws are closed down upon the worksuflciently tight to hold the work while it is being operated upon. Ifthe work to be operated upon is of such character (which is quitecommon) that t-he chuck-jaws must engage its in- 9 5 terior, then thejaws are moved inward sufciently to enter the work, after which they aremoved outwardly to firmly hold the Work.

While I illustrate my improvements in counection with a chuck arrangedto have thejaws moved coincidentally by means of aV right and left handscrew, I contemplate the use of the improvements in connection withchucks Whose jaws are arranged to be moved independently by screwor'otherwise.

I claim as my inventionl. In a lathe-chuck, the combination of a v1ojaw-slide, 'a cylindrical stud projecting there' fromv and adapted toclamp the chuck-jaw against the slide, a chuck-jaw provided with aperipheral series of work-receiving recesses or notches and fitted to berevolved upon said stud, and a dowel fitted to maintain the jaw inadjusted relation to the jaw-slide, substantially as and for the purposeset forth.

2. In a lathe-chuck, the combination of a chuck-body provided with ajawslot having inwardly-projecting tongues,a jawslide fitting said slotand having a longitudinal prolonga; tion bearing in said slot at oneside -of said tongues, and a chuck-jaw secured to said jawslid,substantially as and for the purpose set fort 3. In a lathe-chuck, thecombination of a' i chuck-body provided with a vjaw-slot havinginwardly-projecting tongues, and a jaw-slide fitting said slot andhaving an outward prolongation bearing insaid slot in front of said'tongues, and an inward prolongation bearing in said slot behind saidtongues, and achuckjaw secured to said jaw-slide, substantially as andfor the purpose set forth.

4. In a lathe-chuck, the combination ofy chuek-`body A, provided with aslot having tongues D, .a jaw-slide fitting said slot and having inwardand outward prolongations H andG, and a cylindrical stud, J, achuck-jaw, K, fitted to be revolved upon said stud and provided with aseries of notches or recesses, L, and dowel M, substantially as and forthe purpose set forth.

JAMES HENRY CURRY.

VVitncssesr J AMES PORTER, WILLIAM J oHN PORTER.

